Chapter 2LIving Things

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ecology

The study of interactions of living organisms with one another and with their envirorment.

biotic

Describes living elements in the envirorment.

abiotic

Describes the nonliving part of the enviorment.

poppulation

A group of organisms of the same species that live in a specific geographical area.

Community

All the poppulations of species that live together.

ecosystem

a community of organisms and their abiotic environment

biosphere

the part of earth where life exists

herbivore

organism that obtains energy by eating only plants

carnivore

organism that obtains energy by eating animals

omnivore

an animal that eats both plants and animals

food chain

a series of steps in which organisms transfer energy by eating and being eaten

food web

a diagram that shows the feeding relationships between organisms in an ecosystem

carrying capacity

The largest population that an area can support

prey

an organism that is killed and eaten by another organism

preditor

organism that eats other organisms

symbiosis

relationship in which two species live closely together

mutalism

A relashinship between species where both benefit

commensalism

a relationship between two organisms in which one organism benefits and the other is unaffected

parasitism

A relationship between two organisms of different species where one benefits and the other is harmed

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